We present a systematic study of low-frequency noise in Au nanoparticle chemosensors. All the sensors we have studied exhibit 1/f-type noise at low frequencies. The magnitude of the 1/f noise was smaller in devices with a larger device area, indicating that the 1/f noise is caused by intrinsic processes. The noise amplitude was found to be strongly temperature dependent between 40â€“300 K, with a local peak at around 100 K, and weakly dependent below 40 K. The noise data could not be fit by a single activated process indicating that multiple noise processes must be present in our sensors.

In this paper, an amperometric immunosensor modified with protein A/deposited gold nanocrystals (DpAu) was developed for the ultrasensitive detection of carbofuran residues. First, DpAu were electrodeposited onto the Au electrode surface to absorb protein A (PA) and improve the electrode...

Iron oxides and oxyhydroxides are common and important materials in the environment, and they strongly impact the biogeochemical cycle of iron and other species at the Earthâ€™s surface. These materials commonly occur as nanoparticles in the 3â€“10â€‚nm size range. This paper...

Generation 4 hydroxyl terminated polyamidoamine (PAMAM) dendrimer encapsulated nanoparticles (DENs) were examined as precursors for Pt/TiO2 catalysts. In this preparation method, the dendrimers were initially used to template and stabilize Pt nanoparticles in solution. DENs were then deposited...

AbstractÂ Â Five plant leaf extracts (Pine, Persimmon, Ginkgo, Magnolia and Platanus) were used and compared for their extracellular synthesis of metallic silver nanoparticles. Stable silver nanoparticles were formed by treating aqueous solution of AgNO3 with the plant leaf extracts as...

Abstract IntroductionÂ Â The use of MRI with iron-based magnetic nanoparticles for imaging cells is a rapidly growing field of research. We have recently reported that single iron-labeled cells could be detected, as signal voids, in vivo in mouse brains using a balanced steady-state free...

A new expression for the temperature of melting of a nanoparticle, which agrees with the well-known result of the Debye model, has been obtained within the framework of a rather strict thermodynamic approach. It is shown that the characteristic Debye temperature and the melting temperature can...

Most commercial structural materials are multiphase and it is expected that multiphase nanocrystalline materials will also eventually be the materials of choice for applications. There has been limited research so far on the influence of second-phase particles in a nanostructured matrix. More...